if only,while表示只要，so long as,as long as,if表示只要时,provided that,on condition that .这些单词和短语都有
“只要”的意思，用法有哪些具体区别呢？谢谢，我特别想知道。
再次致敬。
參考答案:while 表转折 放句首的
so long as = as long as 只要的意思
例子：as long as you can do it ,you will win
if only 只要，用虚拟语气，意思是xxxx该多好啊！
If only I had did it!
